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I agree with Curt M, and I measured each resistor before inserting, checking (like Santa) everything twice.? I really can not read the color code anymore.? Before starting, I organized all the parts

A friend has given me his qcx to try and repair. With my limited knowledge I would like some suggestions where to look for the problem. The Lcd lights segments appear to be flashing when qcx powered

One u3s cause tvi on 40,30 and 20m, tx into an inverted L 5m high around 25m long. Antenna wire runs within 1m of TV antenna.? 2nd u3s loaned out at a different location on 20 and 40 into a long wire

Yeah...an SDR dongle and waterfall display image can say a lot. Particularly if your RX can goto 1 MHz. But all SDR dongles will cover the television broadcast spectrum.

It would help if we knew what frequencys, aerials, distance from the offended TV etc.

The QRP Labs oscillators generate a square wave? which may be used with a BPF but the square wave will still be there radiating odd harmonics up to UHF. Try changing the fundamental freq to see if it

Anyone else had their u3s cause interference to digital tv? I have 4 u3s, two of which cause TV interference, when they are actually transmitting the interference is quite bad, but even between

I used the Donegan Optivisors for many years in my medical practice and now have two at home in my shack. One is over 30 years old and still adjusts to different sized heads. I use the 2x and 4x

Hi radio2015@.... The replies you have will work using v3.12a, but I found for CW if you need to alter the transmit frequency, you have to enter a new one via the menu which is not very convenient.

Hi Paul There are many possible reasons for no unwanted sideband cancelation. Not only T1. Each of the two paths I and Q is amplified and phase shifted by IC5, IC6 and IC7. If there is any soldering

Thanks for the replies. I received a package from U3S from Turkey, I haven’t collected the design yet. I decided to ask about the possibility of working in CW in advance. So I can hope that in my

Good suggestion Jerry! One of those “why didn’t I think of that?” moments! Mike VK2DJP Sent: Sunday, April 28, 2019 14:28 To: [email protected] Subject: Re: [QRPLabs] BS 170 Transitor Q1 in U3

On something that might fry like the BS170's, don't install them with the leads going through the holes in the board. Just tack each lead down to the pad with a glob of solder. Perhaps fold the end of

A friend of mine arranged his u3s for manual cw keying, I recall it was a lot of work. He also has integrated the 5 watt PA. The qcx is a much better route to manual cw. I guess you are trying to

Dennis I didn't try to read many component labels, but put my old laptop next to where I was building, and carefully matched parts by position.? as I rechecked each, I avoided placement error in

As a Toolmaker for 39 years, I swear by the Donegan Optivisor. I have accumulated 4 over the years. I have a #10 and #7 at home, and I added the Optiloupe to the #7 (duplicate setup at work). My first

Hi Guys,on step 3.13 the number 181 capacitors are the 5.08 mm wide pin spacing and the holes are the smaller size. It's not mentioned in the instructions and it wasn't till step 3.17 where it

When I was dabbling in guitar building, I tried a couple.? The biggest issue for me was that the right eye didn't focus at the same distance as the left and the? field of view was pretty

Grrr...sockets. The only thing more unreliable than soldering. I used to replace 288 pin 64 bit bus switches on video dsp boards. That was a four minute task. With a soldering iron. One board used a

Ken, A suggestion. If you are going to work on it and add to it etc, when you pull the old 170s out you might want to install sockets for them. Makes swapping them out easier. Dont ask me how I know.